#include <cmath>
#include <iostream>

int main() {
  std::cout << "ilogb(0) " << std::ilogb(0) <<  std::endl;
  std::cout << "log(2) log(10) " << std::log(2) << " " << std::log(10) << std::endl;
  std::cout << "log(3) / log(3) " << int(std::log(3) / std::log(3)) << std::endl; 
  std::cout << "pow(3,1) " << std::pow(3,1) << std::endl;
  std::cout << "ilogb(4) " << std::ilogb(4) << "ilogb(5) " << std::ilogb(5) << std::endl;
}
